While this is true of the Metro, asking directions in Paris is touchy. Apparently, if you ask someone for directions, they are duty-bound to lend all aid and assistence until you have received the directions. This includes going into nearby cafes, bars, hospitals and businesses until they find someone who can help. If it seems you can’t get anyone to help you with directions, this is why.
This is weird advice, but be QUITE. Apparently the number one way Americans annoy Parisians is by talking too loudly in cafes. Be sure to keep your voice down to at or below the level of the other patrons.
Occasionally, you will encounter someone who doesn’t speak english. You’d be amazed at how far you can butcher the language and be forgiven.
North American men are considered exotic. I was flirted with a lot. One does not make continued eye contact; rather, one looks at the target of ones interest, then as soon as they look up, one looks away suddenly. There are two reasons I bring this up; it is rude to keep staring at a person (even doing what a North American wouldn’t consider staring) and if you find a bunch of women (or men, I’m guessing based on your user name) keep suddenly looking away, this is NOT them being rude.
Paris is ridiculously safe, in the sense of violent crime, but does have its share of exceptionally skilled pickpockets, particularly around things like the American Express building. While the risk is probably minor, the inconvenience is significant, so keep things in inside pockets.
There is a HUGE price difference for things between the 1st and 4th arrondismonts (sp?). Spend a day there before buying things.
The food thing. Most resturants are open for lunch, then close, then re-open for dinner. This baffles many people, and one of my favorite images was American backpackers sitting hunched over crepes because they finally found out when a resturant was open. Check a guide book for the actual times. Oh, in a café, if they say they “aren’t currently serving food”, they typically don’t include sandwiches in the things they aren’t currently serving.
It’s been a couple of years, and I’ve only been there once, so please take this with a grain of salt.